background image

2

Using a drill bit appropriate for your mounting hardware, drill 

the pilot holes.

3

Secure the bail mount bracket to the surface using your 

mounting hardware  .

4

Install the bail mount knobs   on the sides of the device.

5

Place the device in the bail mount bracket, and tighten the 

bail mount knobs.

Flush Mounting the Device

NOTICE

Be careful when cutting the hole to flush mount the device. 

There is only a small amount of clearance between the case and 

the mounting holes, and cutting the hole too large could 

compromise the stability of the device after it is mounted.

The included template and hardware can be used to flush mount 

the device in your dashboard.

1

Trim the template, and make sure it fits in the location where 

you want to mount the device.

2

Secure the template to the selected location.

3

Using a 13 mm (

1

/

2

 in.) drill bit, drill one or more of the holes 

inside the corners of the solid line on the template to prepare 

the mounting surface for cutting.

4

Using a jigsaw or a rotary tool, cut the mounting surface 

along the inside line on the template.

5

Place the device in the cutout to test the fit.

6

If necessary, use a file and sandpaper to refine the size of 

the cutout.

7

After the device fits correctly in the cutout, ensure the 

mounting holes on the device line up with the larger 7.2 mm 

(

5

/

16

 in.) holes on the template.

8

If the mounting holes on the device do not line up, mark the 

new hole locations.

9

Using a 7.2 mm (

5

/

16

 in.) drill bit, drill the larger holes.

10

Starting in one corner of the template, place a nut plate 

over the larger hole   drilled in step 9.

The smaller 3.5 mm (

1

/

8

 in.) hole   on the nut plate should 

line up with the smaller hole on the template.

11

If the smaller 3.5 mm (

1

/

8

 in.) hole on the nut plate does not 

line up with the smaller hole on the template, mark the new 

hole location.

12

Repeat steps 10 and 11 to verify placement of the remaining 

nut plates and holes on the template.

13

Using a 3.5 mm (

1

/

8

 in.) drill bit, drill the smaller holes.

14

Remove the template from the mounting surface.

15

Starting in one corner of the mounting location, place a nut 

plate   on the back of the mounting surface, lining up the 

large and small holes.
The raised portion of the nut plate should fit into the larger 

hole.

16

Secure the nut plate to the mounting surface by fastening an 

included M3 screw   through the smaller 3.5 mm (

1

/

8

 in.) 

hole.

17

Repeat steps 15–16 to secure the remaining nut plates to the 

mounting surface.

18

Install the rubber gasket   on the back of the device.
The pieces of the rubber gasket have adhesive on the back. 

Make sure you remove the protective liner before installing 

them on the device.

19

If you will not have access to the back of the device after you 

mount it, connect all necessary cables to the device before 

placing it into the cutout.

NOTE: 

To prevent corrosion of the metal contacts, cover 

unused connectors with the attached weather caps.

20

Apply marine sealant between the mounting surface and the 

device to properly seal and prevent leakage behind the 

dashboard.

21

If you will have access to the back of the device, apply 

marine sealant around the cutout.

22

Place the device into the cutout.

23

Secure the device to the mounting surface using the included 

M4 screws  .

24

Wipe away all excess marine sealant.

25

Install the decorative bezel by snapping it in place around the 

edges of the device.

Cable and Connection Considerations

• The cables may have been packaged without the locking 

rings installed. If so, you should route the cables before you 

install the locking rings.

• After connecting a locking ring to a cable, make sure the ring 

is securely connected and the O-ring is in place so the 

connection remains secure.

Power/NMEA

®

 0183 Cable

• The wiring harness connects the device to power, NMEA 

0183 devices, and a lamp or a horn for visible or audible 

alerts.

• If it is necessary to extend the NMEA 0183 or alarm wires, 

you must use 22 AWG (.33 mm²) wire.

2

Summary of Contents for GPSMAP 74 Series

Page 1: ...mperature range for this device is listed in the product specifications Extended exposure to temperatures exceeding the specified temperature range in storage or operating conditions may cause device...

Page 2: ...ify placement of the remaining nut plates and holes on the template 13Using a 3 5 mm 1 8 in drill bit drill the smaller holes 14Remove the template from the mounting surface 15Starting in one corner o...

Page 3: ...iled mapping When connecting Garmin Marine Network devices to this device observe these considerations All devices connected to the Garmin Marine Network must be connected to the same ground If multip...

Page 4: ...be connected to a common ground For two way communication with a NMEA 0183 device the internal ports on the NMEA 0183 data cable are not linked For example if the input of the NMEA 0183 device is con...

Page 5: ...etwork on your boat to read data from compatible devices such as certain engines The engine network follows a standard and uses proprietary messages You should connect only one chartplotter to one eng...

Page 6: ...s obsolete 130312 Temperature obsolete Transmit PGN Description 126464 Transmit and receive PGN list group function 127497 Trip parameters Engine Receive PGN Description 065030 Generator average basic...

Page 7: ...lectronic engine controller 2 61444 Electronic engine controller 1 65031 Exhaust temperature 65172 Engine auxiliary coolant 65252 Shutdown 65253 Engine hours and revolutions 65262 Engine temperature 1...

Page 8: ...2016 Garmin Ltd or its subsidiaries support garmin com...

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